Microsoft has acquired the San Francisco-based email application builder Acompli Inc., in a deal valued at $200 million.

The announcement isn’t exactly a surprising one considering how Microsoft accidentally leaked the news before Thanksgiving in a blog post, but it does show how serious the company is about supporting multiple platforms.

Re/Code was the first to report the acquisition, which is believed to be an all-cash deal.

“We’re excited about what’s possible as we build on the app’s success and bring it together with work currently in progress by the Outlook team,” said Rajesh Jha, VP of Outlook. “Our goal is to deliver fantastic cross-platform apps that support the variety of email services people use today and help them accomplish more.”

Acompli’s main offering is an Android and iOS email client designed to simplify certain tasks on mobile devices, like sending typical responses, sorting messages and searching for attachments. But even though it’s built for Microsoft’s two biggest rival’s platform, Acompli’s technology is a perfect fit for Microsoft because it’s main customers are all larger companies. More to the point, it already plugs into Microsoft’s Exchange email server software.

It isn’t clear what Microsoft intends to do with Acompli yet, though we’d imagine there will be some kind of integration with Outlook.com and its mobile client. After all, Microsoft needs to keep up with the innovation that’s happening in email right now. Last year Google introduced a new tabs interface for Gmail, before launching its new Inbox app in October. Meanwhile IBM is also looking at ways to simplify email for its corporate clients.

By integrating Acompli with Outlook, Microsoft will be able to compete with these new innovations, however that doesn’t necessarily mean the software won’t be available on other platforms. Javier Soltero, Founder of Acompli, said he remains “committed to the original Acompli vision of making the best mobile email application on any platform and across all services.”

That’s in line with Microsoft’s recent push to bring its products and services to other mobile operating systems. Last March, it finally released Office for iPad after years of delays, and most recently it said it would integrate Dropbox’s file sharing service with Office 365.